From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <Blake.Galbreath@GMail.com>
Date: Fri, 3 Jul 2020 11:58:56 -0500
Subject: [PATCH] Add PrepareResultEvent / PrepareGrindstoneEvent

Adds a new event for all crafting stations that generate a result slot item

Anvil and Grindstone now extend this event

Grindstone is a backwards compat from a previous PrepareGrindstoneEvent

diff --git a/src/main/java/com/destroystokyo/paper/event/inventory/PrepareGrindstoneEvent.java b/src/main/java/com/destroystokyo/paper/event/inventory/PrepareGrindstoneEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..449e8c06f8434b59d49a76481fa60c5c49e80579
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/inventory/PrepareGrindstoneEvent.java
@@ -0,0 +1,28 @@
+package com.destroystokyo.paper.event.inventory;
+
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.inventory.InventoryEvent;
+import org.bukkit.inventory.GrindstoneInventory;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Called when an item is put in a slot for grinding in a Grindstone
+ * @see com.destroystokyo.paper.event.inventory.PrepareResultEvent
+ */
+@Deprecated
+public class PrepareGrindstoneEvent extends PrepareResultEvent {
+
+    public PrepareGrindstoneEvent(@NotNull InventoryView inventory, @Nullable ItemStack result) {
+        super(inventory, result);
+    }
+
+    @NotNull
+    @Override
+    public GrindstoneInventory getInventory() {
+        return (GrindstoneInventory) super.getInventory();
+    }
+
+}
diff --git a/src/main/java/com/destroystokyo/paper/event/inventory/PrepareResultEvent.java b/src/main/java/com/destroystokyo/paper/event/inventory/PrepareResultEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..045ce9ec3c9134aced5f5235b760ac85599d16c6
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/inventory/PrepareResultEvent.java
@@ -0,0 +1,48 @@
+package com.destroystokyo.paper.event.inventory;
+
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.inventory.InventoryEvent;
+import org.bukkit.event.inventory.InventoryType;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Called when an item is put in an inventory containing a result slot
+ */
+public class PrepareResultEvent extends InventoryEvent {
+
+    private static final HandlerList handlers = new HandlerList();
+    private ItemStack result;
+
+    public PrepareResultEvent(@NotNull InventoryView inventory, @Nullable ItemStack result) {
+        super(inventory);
+        this.result = result;
+    }
+
+    /**
+     * Get result item, may be null.
+     *
+     * @return result item
+     */
+    @Nullable
+    public ItemStack getResult() {
+        return result;
+    }
+
+    public void setResult(@Nullable ItemStack result) {
+        this.result = result;
+    }
+
+    @NotNull
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}
diff --git a/src/main/java/org/bukkit/event/inventory/PrepareAnvilEvent.java b/src/main/java/org/bukkit/event/inventory/PrepareAnvilEvent.java
index 77109a07f07aa6985106dc1a9ad5218f6c7f360f..f1f6f4ab4f81a3f21e757fef4a30b00e94371f8d 100644
--- a/src/main/java/org/bukkit/event/inventory/PrepareAnvilEvent.java
+++ b/src/main/java/org/bukkit/event/inventory/PrepareAnvilEvent.java
@@ -1,5 +1,6 @@
 package org.bukkit.event.inventory;
 
+import com.destroystokyo.paper.event.inventory.PrepareResultEvent;
 import org.bukkit.event.HandlerList;
 import org.bukkit.inventory.AnvilInventory;
 import org.bukkit.inventory.InventoryView;
@@ -10,14 +11,16 @@ import org.jetbrains.annotations.Nullable;
 /**
  * Called when an item is put in a slot for repair by an anvil.
  */
-public class PrepareAnvilEvent extends InventoryEvent {
+// Paper start - extend PrepareResultEvent
+public class PrepareAnvilEvent extends PrepareResultEvent {
 
-    private static final HandlerList handlers = new HandlerList();
-    private ItemStack result;
+    //private static final HandlerList handlers = new HandlerList();
+    //private ItemStack result;
 
     public PrepareAnvilEvent(@NotNull InventoryView inventory, @Nullable ItemStack result) {
-        super(inventory);
-        this.result = result;
+        super(inventory, result);
+        //this.result = result;
+        // Paper end
     }
 
     @NotNull
@@ -33,13 +36,14 @@ public class PrepareAnvilEvent extends InventoryEvent {
      */
     @Nullable
     public ItemStack getResult() {
-        return result;
+        return super.getResult(); // Paper
     }
 
     public void setResult(@Nullable ItemStack result) {
-        this.result = result;
+        super.setResult(result); // Paper
     }
 
+    /* // Paper - comment out
     @NotNull
     @Override
     public HandlerList getHandlers() {
@@ -50,4 +54,5 @@ public class PrepareAnvilEvent extends InventoryEvent {
     public static HandlerList getHandlerList() {
         return handlers;
     }
+    */ // Paper
 }